Safety lock



Dec. 1924- 7 1,518,747

- c. A. MULLER Filed March 9, 1921 Patented Dec. 9, 1921; i

STATES TENT tines.

SAFETY LOCK.

Application filed. March 9, 1821.

To all whom it may concern:

Be it known that I, CARL Aueusr MtiLLne, a citizen of the German Republic, and re siding at lVitzenhausen, VV'erra, Germany, have invented certain new and useful Improvements in Safety Locks, of which the following is a specification.

This invention relates to improvements in the construction of barrels and casings for looks of the rotary barrel and tumbler type, and it has for its object to simplify the method of construction and consequently to reduce the cost of production.

According to the present invention, both the barrel and the casing of the lock are built-up of thin plates or laminae appropriately shaped to provide, when arranged and secured together to form said barrel and easing, the openings required for the looking members.

The laminated barrel and casing, from the point of view of operation of the lock, constitute in effect a solid rotary barrel, and a solid fixed casing, in contradistinction to the known type of disc locks, wherein a series of notched or toothed discs are fitted in axial alignment within a cylindrical casing and are adapted to be moved relatively by means of a key to enable the desired looking or unlocking operation to be effected.

One form of barrel and casing is shown by way of example in the accompanying draw' ing, in which:

Fig. 1 is a perspective view showing the laminae constituting the barrel, in their relative positions, but spaced apart;

Fig. 2 is a perspective view correspond ing to Fig. 1, showing the laminae pressed together ready for receiving the securing screws to form the completed barrel;

Fig. 3 is a perspective view showing a few of (;he laminae employed to form the casing; an

Fig. 4 is a plan of the laminated barrel.

In carrying out the invention, according to one mode as shown in the accompanying drawings, a lock barrel (Figs. 1, 2 and 3) is built-up of a number of circular metal discs 0, d, cl, 7, g. g, by arranging them face to face, and securing them when so arranged by means of screws which are passed through the holes h.

The discs are slotted as shown, to form, when secured together, recesses or openings for the reception of the pin tumblers, in the usual manner.

Serial No. 450,893.

The casing is similarly built-up of a number of metal rings is slotted as at b,.to form, when secured together, recesses for the locking members or pins.

The barrel and casing must correspond one with the other, but it is not essential that the same number of discs and rings be employed to form their respective elements. The slots at are only provided in the barrel (Figs. 2 and at) while the recesses corresponding to the larger recesses b are also formed in the casing (Fig.

Both the discs and the rings can be read-' ily pressed or stamped out of sheet metal.

As will be seen from Fig. 1, the construction of several discs is repeated; for example, the discs 0 are of the same construction as also the disc d, and so on, to g.

This feature considerably simplifies manu facture. The discs 0?, g are of larger diameter than that of the other discs, and the bore of the laminated casing is therefore enlarged at the middle portion to accommodate the portion of the barrel formed by these larger discs, by making the two middle rings 0 of the casing of correspondingly enlarged bore. By this arrangement the laminated barrel is guided in the easing in a simple manner.

The discs and rings can be stamped out of sheet metal in presses with an automatic feed, thus expediting the manufacture, and producing clean sharp edges to the slots, which result in the production of extreme- 1y smooth surfaces of the recesses formed by the slots, when the discs are secured together, to form the barrel.

A finishing operation on these surfaces is thus not required, and in consequence a large saving in labour is ensured in this respect.

It will be readily appreciated that appropriately slotted discs may be selected to form, when secured together, recesses to re ceive a group or groups of tumblers on one or both sides of the vertical centre line, as desired, the ring for building up the easing being selected to correspond.

The screw holes h in the discs can, of course, be stamped out at the same time as the discs.

The barrel and casing are advantageously built up by arranging the discs and rings on suitable cores to facilitate assembly.

The thickness of the edges of the recesses for the locking devices may correspond to the thickness of a number of discs, for example three in number, While the thickness oi? the part projecting in the keyhole may correspond to the thickness of a single disc.

What I claim is:

1. In a barrel lock of the rotary barrel and tumbler type, the combination of a barrel and a casing of thin lamina appropriately shaped to provide, When assembled the openings required for the locking members of the lock substantially as set forth.

2. A. barrel lock as snecifiecl in claim. 1. in. which the laminae for the barrel consist of appropriately slotted discs While the laminse tor the casing consist of appropriately slotted rings, substantially as set forth.

3. A barrel lock as specified in claim 2, in which the slots in several assembled laminae are utilized to form a single recess, substantially as set forth.

l. A barrel lock as specified in claim 1, in which the laminae are stambetl out of sheet metal, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses. H

CARL AUGUST MULLER} Vvitnesses UDO HAAsn, SOPHTE MI'JLLER. 

